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Flow process development and optimization of halo-amine coupling through customized flow processing equipment using DoE approach

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A Correction to this article was published on 06 October 2020

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Abstract

Customized flow equipment was utilized to develop and optimize the halo-amine coupling reaction. In this study, the development work was conducted through the statistical design of experiments (DoE) approach via a 2-factor interaction model. Experiments were conducted in two different reactor designs such as packed bed (type 1) and tubular reactor (type 2) set up. The effect of molar ratios of 4-methoxyaniline (1) and 1-(bromomethyl)-4-nitrobenzene (2), temperature, residence time, and base equivalence of N, N-Diisopropylethylamine were studied in detail. The data generated was in good agreement with significant improvements that were achieved in the overall reaction time and selectivity towards the desired product as compared to the batch process. The halo-amine coupling reaction in batch condition would take on an average of 90 to 120 min, which was effectively accomplished in 6 to 9 mins in both the flow reactor types. The advantage of type 2 over type 1 was found to be better towards the selectivity of the desired product with minimized impurities. A certain degree of back-mixing in the type 1 reactor was observed, which led to an increase in the impurity formation, whereas these impurities were practically less formed in the type 2 reactor. The reaction model is in good agreement with the reaction conditions.

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Change history

  • 06 October 2020

    This erratum is published as author affiliation was overlooked during proofing Dayanand Sagar College of Engineering needs to be correctly read as: Dayananda Sagar College of Engineering.

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Acknowledgments

The authors would like to acknowledge and thank Dr. Jegadeesh Thampi, BU-Head, Chemical Development, Syngene International Ltd., and Dr. Narendra Ambhaikar, Head-PRD, Chemical Development, Syngene International Ltd, for providing adequate support, guidance and motivation throughout the work.

Funding

This work was supported by Syngene International Ltd, Bengaluru, India and all the necessary approvals are in place to publish the same.

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Correspondence to Girish Basavaraju or Ravishankar Rajanna.

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Highlights

• Development of halo-amine coupling reaction in continuous flow.

• Optimization of halo-amine coupling through the statistical design of experiments approach.

• Different reactor designs such as packed bed and tubular reactor were tested effectively.

• Successfully transformed from a known batch procedure to a continuous flow process with significant time reduction and improved selectivity.

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Basavaraju, G., Lydia, S. & Rajanna, R. Flow process development and optimization of halo-amine coupling through customized flow processing equipment using DoE approach. J Flow Chem 10, 571–582 (2020). https://doi.org/10.1007/s41981-020-00099-1

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  • DOI: https://doi.org/10.1007/s41981-020-00099-1

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